What are the types of spinel?

Spinel is a mineral group that includes several types based on their chemical composition. The most well-known types are magnesium-aluminum spinel (MgAl2O4), which is the classic spinel, and other variations like chromium spinel (CrAl2O4), iron spinel (FeAl2O4), and manganese spinel (MnAl2O4). Additionally, spinel can occur in various colors and is often used as a gemstone, with colors ranging from red to blue and green, depending on the presence of different metal ions. Other types include synthetic spinels, which are created in laboratories for various applications.